Nested Structures

[eDD]

Hello, I need help accesing a structure:

typedef struct _SOME_DATA
{
    int index;
    int descriptor;
    struct _KEYS *keys;
    struct _SOME_DATA *next;
} SOME_DATA;

typedef struct _KEYS
{
    char *key1;
    char *key2;
} KEYS;

typedef SOME_DATA *ptr;
typedef SOME_DATA *list;

And i want to do something like this:

char *ptrkey1;
char *ptrkey2;
ptr = next;
ptrkey1 = (char *)malloc(strlen(function_parameter) * sizeof(char));
strcpy(ptrkey1, function_parameter_KEY.key1);
// Program breaks here
strcpy((char *)&next->keys->key1, ptrkey1);

Has anyone an idea?, thanks in advance!!!

[Brafil]

Yes. Declare KEYS before SOME_DATA. Or put a forward declaration there:

struct _KEYS;

typedef struct _SOME_DATA
{
    int index;
    int descriptor;
    struct _KEYS *keys;
    struct _SOME_DATA *next;
} SOME_DATA;

typedef struct _KEYS
{
    char *key1;
    char *key2;
} KEYS;

typedef SOME_DATA *ptr;
typedef SOME_DATA *list;

ptrkey1 = (char *)malloc(strlen(function_parameter) * sizeof(char));

You shouldn't cast malloc to char *. That would be easier. and sizeof(char) is always 1, so you can drop it. The most fatal error is that you forgot the terminating NUL character - it also needs a byte. And you could directly copy from function_parameter_KEY.key1 to next->keys->key1

--> No & at the beginning. That's probably why it breaks